To determine how many lawns Gio needs to mow to reach his savings goal of $900, we first need to find out how much more money he needs to save beyond his current $250.
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Calculate the amount Gio still needs: \[ 900 - 250 = 650 \] Gio needs an additional $650.
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Since he earns $25 for each lawn he mows, we can find out how many lawns he needs to mow by dividing the amount he still needs by the amount he earns per lawn: \[ \frac{650}{25} = 26 \]
Therefore, Gio will need to mow 26 lawns to reach his goal of $900.